🚀 Rocket Equation Calculator

What the rocket equation tells you

The Tsiolkovsky rocket equation gives the maximum velocity change (delta-v) a rocket can achieve by burning its propellant: Δv = I_sp × g₀ × ln(m₀ / m_f), where I_sp is the engine’s specific impulse in seconds, g₀ is standard gravity, m₀ is the rocket’s initial (wet) mass, and m_f is its final (dry) mass after the propellant is used.

How this calculator works

Enter the engine’s specific impulse, the rocket’s initial mass including fuel, and its final mass once the fuel is spent. The calculator applies the Tsiolkovsky equation to find the total delta-v available, shown in both kilometers and meters per second, along with the mass ratio (initial mass over final mass).

Delta-v is the standard way engineers compare a rocket’s total maneuvering capability, independent of the specific mission profile. This calculator is for general aerospace education and planning purposes.